commons-math-legacy/src/main/java/org/apache/commons/math4/legacy/stat/descriptive/SummaryStatistics.java [212:222]:
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    public double getStandardDeviation() {
        double stdDev = Double.NaN;
        if (getN() > 0) {
            if (getN() > 1) {
                stdDev = JdkMath.sqrt(getVariance());
            } else {
                stdDev = 0.0;
            }
        }
        return stdDev;
    }
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commons-math-legacy/src/main/java/org/apache/commons/math4/legacy/stat/descriptive/DescriptiveStatistics.java [267:277]:
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    public double getStandardDeviation() {
        double stdDev = Double.NaN;
        if (getN() > 0) {
            if (getN() > 1) {
                stdDev = JdkMath.sqrt(getVariance());
            } else {
                stdDev = 0.0;
            }
        }
        return stdDev;
    }
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